In spermatogenesis, the phases of maturation involve

The correct option is "formation of spermatids from primary spermatocytes through meiosis".

Spermatogenesis is the biological process by which male gametes, known as spermatozoa, are produced from germ cells in the seminiferous tubules of the testes. This complex process is divided into three major successive phases:
1. Multiplication (Mitotic) Phase: Diploid primordial germ cells (gonocytes) undergo repeated mitotic divisions to produce a large number of diploid spermatogonia.
2. Growth Phase: Spermatogonia actively accumulate nutrients and grow in size to transform into diploid primary spermatocytes. No division occurs during this phase.
3. Maturation (Meiotic) Phase: This is the phase where cell division by meiosis takes place. Each diploid primary spermatocyte undergoes the first meiotic division (Meiosis I, which is a reductional division) to form two haploid secondary spermatocytes. Subsequently, these secondary spermatocytes undergo the second meiotic division (Meiosis II, which is an equational division) to produce four haploid spermatids.

Therefore, the maturation phase specifically involves the meiotic division of primary spermatocytes to ultimately form haploid spermatids.